In Ireland during the 1940s, the stigma meant that most unmarried mothers had no option but to place their babies for adoption. 72-year-old Viv came on DNA Family Secrets hoping to find her older sister, who was taken from her mum as the baby. In this podcast Turi catches up with Viv a year after her episode was broadcast.

In the last 50 years, the number of single parent households in the UK has almost quadrupled to 23%. 43-year-old Sarah never met here dad and came to DNA Family Secrets to see if he could be found.

The mystery of Kaspar Hauser and whether he was the hereditary Prince of Baden is considered to be one of the greatest historical mysteries of the 19th century. Previous genetic research trying to answer the question gave conflicting results. Professor Turi King discusses her work and the work carried out by the team, led by Walther Parson, which brought new genetic techniques to bear on the question and which shows that Kaspar Hauser was not the hereditary Prince of Baden.

91-year-old Jean was evacuated in World War II. She never saw her mother again and was told that she died before the war ended. She appeared on series three of DNA Family Secrets to try and find out if the stories about her mother's death were true. In this podcast Turi catches up with Jean a year after her episode was broadcast.

Sir Paul Nurse was in his 50s when he discovered that the person he thought was his sister was his mum and the couple he thought were his parents were really his grandparents. With all of them now passed away, there was no one he could ask as to the identity of his father. Years later, he took a DNA test and Professor Turi King traced his father for him.

Professor Daniel Panne discusses his work looking at the structure of chromosomes.

Nearly a 100,000 people in Britain were brought up in foster care in the 1970s, 50-year-old Matthew was one of them. Although he knew his birth mother was English, he didn't know his father's identity. Matthew appeared on the second series of DNA Family Secrets to try and find out where his father was from.

Jackie is one of over three million children orphaned during World War II, for nearly 60 years, he and his wife Lita have been searching for any information about his past.

Over 6000 sperm donor babies were born in the UK in the 1970s. 47-year-old Mel, only found out as a teenager that she is one of them. Mel appeared on DNA Family Secrets to discover if testing her DNA might reveal her donor's identity and find any potential family.

Geneticist Professor Turi King shares her views on donor anonymity in response to the HFEA (Human Fertilisation & Embryology Authority) opening a consultation on UK fertility law.